Removal of lead by exopolysaccharides from Paenibacillus peoriae
strainTS7 isolated from rhizosphere of durum wheat
Authors
Samira Fella-Temzi, Drifa Yalaoui-Guellal, Miguel A Rodriguez-Carvajal, Djellali Belhadi, Khodir Madani, Yahia Kaci
Publication date
2018/10/1
Journal
Biocatalysis and agricultural biotechnology
Volume 16 Pages 425-432 Publisher Elsevier Description
This work aimed to study the removal of heavy metal ions in aqueous solution by extracellular polysaccharides (EPS) extracted from bacterial strain coded TS7. The 16S ribosomal RNA gene sequencing allowed us to identify this strain
as Paenibacillus peoriae. The EPS were defined by GLC-MS and 1H NMR as a
homopolysaccharides of fructose. The effect of contact time, initial metal ions concentration, mass of the polysaccharide and pH on the metal uptake were
investigated by employing batch adsorption technique. The results showed that the maximum removal percentage was achieved at 180 min with an initial lead
concentration of 100 ppm and the mass of 0.5 g L−1 EPS at pH 6.8. The maximal
metal uptake (qmax) value in Dubinin–Radushkevich (D–R) adsorption isotherm of
EPS was found 277.54 mg g−1. The adsorption surface of the metal at surface of TS7
EPS was confirmed through scanning …
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